Abstract 115: Compliant Mattresses Adversely Affect CPR Quality
Background: In-hospital resuscitations are often conducted on a compliant mattress which deforms with chest compressions. Loss of CPR quality, specifically depth of compressions, is known to occur; however, empirical evidence on actual loss is limited. This study evaluated CPR quality performed on a manikin positioned on a hospital bed with a foam mattress and an air-filled mattress.
Methods: Twelve CPR trained males performed CPR on a ResusciAnne Skill Reporter instrumented with a linear potentiometer and a loadcell. Each subject performed 30 seconds of continuous chest compressions with the manikin placed on a backboard on a standard hospital bed. Mattress order was counterbalanced. Mattress compression was measured using ½” reflective markers placed on top of the backboard. The reflective markers were sampled at 120 Hz and force and depth were sampled at 1080 Hz using a motion analysis system. Independent t-tests compared CPR variables under two conditions: total distance 40–50 mm and chest compression depth 40–50 mm.
Results: Mattress compliance significantly affected CPR quality, see Table 1. If the caregiver perceives total distance, rather than chest compression depth inadequate compressions are delivered.
Conclusions: When CPR is performed on a firm surface (floor) chest compression depth is directly related to the applied compression force. When CPR is performed on a mattress the depth of chest compression is affected by both the applied compression force and the amount of compliance in the underlying mattress.
- © 2010 by American Heart Association, Inc.